The invention discloses flame-retardant protective clothing polyester fabric. The flame-retardant protective clothing polyester fabric is prepared by cabling and twisting flame-retardant polyester fiber modified by polyphenylene sulfide with aramid fiber, basalt fiber and polyphenylene sulfide fiber, weaving, then finishing by using a softening agent, and drying. The flame-retardant protective clothing polyester fabric has the beneficial effects as follows: the flame-retardant protective clothing polyester fabric has excellent flame retardance, the advantages of various fibers complement one another to improve the flame retardance and the melt dripping resistance of a blended product, and during combustion, the flame-retardant protective clothing polyester fabric does not shrink and produce melt drips, so that the flame-retardant protective clothing polyester fabric is blended base fabric with relatively high cost performance; chemical substances harmful to a human body are not added, the preparation process causes a small environment impact and does no harm to the human body, and the flame-retardant protective clothing polyester fabric is high in softness and smooth in hand feel; the flame-retardant protective clothing polyester fabric is stable and long-lasting in flame retardance, an effective way of increasing product diversity is provided, an important method for improving product performance and expanding the application range is provided, and the commercial value is very high.